Hey there @Hongkong! Welcome to the Community!
As you already mentioned Fitbit currently does not have support for Chinese but I encourage you posting your request on the Feature Request Board which our product development teams consult regularly to ensure we're delivering on what our customers need and want. If you find that a similar suggestion has already been made by another member of the community, you can vote for their idea and add your comments.
Hope to see you posting more often!
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